4xt6 >> naxx10 loot?

Rawr tells me I should wear four pieces of T6 for dps instead of any naxx/heroic 10-men loot. Didnt think the set-bonus was that strong and I'm quite disappointed to miss four possible new pieces of loot. I just want to know: is this true or maybe some mistake,
because I never heard any ferals complaining about T6 bonus ^^

4T6 is, ballpark, 2-3% total damage increase. Not gigantic, but with new gems, it doesn't sound unreasonable to be worth it to drop 2 new items with 2 old items and still get an overall damage increase.